DD(X) UNDEX
DD(X) Machinery and Electronics Shock Mitigated Rafting: Modeling, Simulation and Validation

Joel Myers, Northrop Grumman Ship Systems
Dr. Russ Miller, Anteon
Jeff O'Brien, Anteon
Brendan Woolrich, Anteon
Jeff Gorfain, Anteon

Abstract:
The DD(X) approach for reducing the shock environment for machinery and electronics equipment is to employ shock mitigated rafting systems.  The reduced shock environment allows for the use of commercial-off-the-shelf (COTS) or modified COTS (MOTS) equipment instead of heavier and more expensive shock hardened equipment.  The verification, validation and accreditation (VV&A) process for the rafting modeling and simulation (M&S) design approach is presented.  Data obtained from DD(X) rafting testing is compared with predictions obtained using M&S tools. 

This paper focuses on the comparison of the test data obtained for the rafting test articles with the M&S predictions.  Test articles were built and tested as part of the VV&A process.  Standard MIL-S-901D heavy weight tests using the floating shock platform (FSP) were performed.  Instrumentation included deflection, strain, velocity, accelerometer and force gages.  Instrumentation and data collection was provided by NSWC/CD/UERD.  Acceptance criteria for validation are also discussed.

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